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ST10F276E Datasheet(PDF) 73 Page - STMicroelectronics

Part # ST10F276E
Description  16-bit MCU with MAC unit 832 Kbyte Flash memory and 68 Kbyte RAM
PDF  235 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST10F276E Datasheet(HTML) 73 Page - STMicroelectronics

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ST10F276E
Central processing unit (CPU)
Doc ID 12303 Rev 3
73/235
6.1
Multiplier-accumulator unit (MAC)
The MAC coprocessor is a specialized coprocessor added to the ST10 CPU Core in order to
improve the performances of the ST10 Family in signal processing algorithms.
The standard ST10 CPU has been modified to include new addressing capabilities which
enable the CPU to supply the new coprocessor with up to 2 operands per instruction cycle.
This new coprocessor (so-called MAC) contains a fast multiply-accumulate unit and a repeat
unit.
The coprocessor instructions extend the ST10 CPU instruction set with multiply, multiply-
accumulate, 32-bit signed arithmetic operations.
Figure 15.
MAC unit architecture
Operand 2
Operand 1
Control Unit
Repeat Unit
ST10 CPU
Interrupt
Controller
MSW
MRW
MAH
MAL
MCW
Flags MAE
Mux
8-bit Left/Right
Shifter
Mux
Mux
Sign Extend
16 x 16
Concatenation
signed/unsigned
Multiplier
40-bit Signed Arithmetic Unit
0h
0h
08000h
40
16
40
40
32
32
16
40
40
40
40
40
Scaler
AB
40
GPR Pointers *
IDX0 Pointer
IDX1 Pointer
QR0 GPR Offset Register
QR1 GPR Offset Register
QX0 IDX Offset Register
QX1 IDX Offset Register



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